DS1307 Real Time Clock Module

Image Courtesy of Adafruit

This Real Time Clock (RTC) breakout kit includes the DS1307 IC and all the supporting circuitry. It requires some soldering to assemble, but Adafruit provides instructions on the product page. Alternatively, you can assemble the components of this module directly on a breadboard using the schematic from the book without any soldering. You can find a list of all the parts on the Adafruit website.